"Amazon deforestation is close to tipping point": https://www.sciencedaily.com/releases/2018/03/180319124212.htm
"Deforestation of the Amazon is about to reach a threshold beyond which the region's rainforest may undergo irreversible changes that transform the landscape into degraded savanna with sparse shrubby plant cover and low biodiversity. Deforestation rates ranging from 20% to 25% could turn the hydrological cycle unable to support its ecosystem."